论文标题
格里菲斯（Griffiths）的阶段靠近莫特（Mott）过渡
Griffiths-like phase close to the Mott transition
论文作者
论文摘要
我们探索了Mott临界点附近的共存区域，该区域使用可压缩的单元旋转$ 1/2 $ ising样模型。我们分析了旋转液体候选$κ$ - （bedt-ttf）$ _ 2 $ cu $ _2 $（CN）$ _ 3 $的案例，那里靠近Mott Critical Critical Charter Point Methallic金属质水坑，并具有绝缘的铁电阶段。我们的结果是四倍：$ i $）在越过一阶过渡线时，格吕尼森参数的普遍发散行为； $ ii $）基于缩放论点，我们表明，在共存区域内，对于接近关键点的$ $ $系统，放松时间依赖于熵。 $ iii $）我们提出了电grüneisen参数$γ_e$，该参数量量化了电流效应； $ iv $）我们将金属/绝缘共存区域确定为类似电子格里菲斯的阶段。我们的发现表明，$γ_e$控制着接近临界点的介电响应，并且在共存区域中出现了类似电子格里菲斯的阶段。
We explore the coexistence region in the vicinity of the Mott critical end point employing a compressible cell spin-$1/2$ Ising-like model. We analyze the case for the spin-liquid candidate $κ$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$, where close to the Mott critical end point metallic puddles coexist with an insulating ferroelectric phase. Our results are fourfold: $i$) a universal divergent-like behavior of the Grüneisen parameter upon crossing the first-order transition line; $ii$) based on scaling arguments, we show that within the coexistence region, for $any$ system close to the critical point, the relaxation time is entropy-dependent; $iii$) we propose the electric Grüneisen parameter $Γ_E$, which quantifies the electrocaloric effect; $iv$) we identify the metallic/insulating coexistence region as an electronic Griffiths-like phase. Our findings suggest that $Γ_E$ governs the dielectric response close to the critical point and that an electronic Griffiths-like phase emerges in the coexistence region.
